Question Paper Mechanical Engineering
1. Wet compression in vapour compression cycle means
(a) presence of water in refrigerant vapour during compression
(b) Presence of liquid refrigerant in refrigerant vapour during compression
(c ) compression of liquid refrigerant only
(d) compression of water only
Ans. B
2. In a ideal vapour absorption system the absorber pressure is equal to the pressure of
(A) generator
(b) condenser
(c ) evaporator
(d) expansion device
Ans. C
3. The vapour compression refrigeration cycle operates on reversed
(b) Rankine cycle
(b) Joule’s cycle
(c ) Atkinson cycle
(d) Ericsson cycle
Ans. A
4. In a vapour absorption refrigerator , heat is rejected in
(a) condenser only
(b) generator only
(c ) absorber only
(d) condenser and absorber
Ans. D
5. The wet bulb depression is zero when relative humidity equals
(a) zero
(b)50%
(c )75%
(d)100%
Ans. D
6. On a psychometric chart what does a vertical downward represent ?
(a) Adiabatic saturation
(b) Sensible cooling
(c )Dehumdification
(d) Humidification
Ans. C
7. The curved lines on a psychrometric chart indicated
(a )relative humidity
(b) specific humidity
(c ) dry bulb temperature
(d) wet bulb temperature
Ans. A
8. In winter air conditioning the inside design conditions are given by the following
(a) 250 C DBT, 50% RH
(b) 250 C DBT, 60% RH
(c ) 210 C DBT ,50 % RH
(d)210 C DBT, 60% RH
Ans. D
9. Room sensible heat factor is defind as (RSH : Room sensible heat, RLH : Room Latent heat) –
(a) RSH/(RSH+RLH)
(b)RLH/(RSH+RLH)
(c )RSH/RLH
(d) None of the above/ mijskDr esa dksbZ ugha
Ans. A
10. Indication of amount of moisture in air is given by
(a) dry bulb temperature
(b) wet bulb temperature
(c )dew point temperature
(d) saturation temperature
Ans. B
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